Best work will take reduced time and little hesitation (7)
I believe the answer is:
optimum
'best' is the definition.
(optimum means the best possible)
'work will take reduced time and little hesitation' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'will take' says to put letters next to each other.
'reduced' means to remove the last letter.
'and' means one lot of letters go next to another.
'little hesitation' becomes 'um'.
'time' with its last letter removed is 'tim'.
'op'+'tim'+'um'='OPTIMUM'
(Other definitions for optimum that I've seen before include "Most favourable (conditions)" , "Best (result)" , "Most appropriate" , "Most favourable point" , "model" .)